python exception not raised if finally returns value [duplicate]











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  • Weird Try-Except-Else-Finally behavior with Return statements

    2 answers




Can anyone explain why the following example does not raise the Exception?



def foo():

    try:

        0/0

    except Exception:

        print('in except')

        raise

    finally:

        print('in finally')

        return 'bar'



my_var = foo()

print(my_var)


This just returns:



in except

in finally

bar


Where as the same code without the return 'bar' statement throws the exception:



in except

in finally

Traceback (most recent call last):

  File "test.py", line 10, in <module>

    my_var = foo()

  File "test.py", line 3, in foo

    0/0

ZeroDivisionError: division by zero





python exception exception-handling try-except







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 Nov 22 at 21:39


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.















  • you can catch the exception, assign it to a previously defined None variable and then reraise it in finally: Bit trickier to get working in python 3 than 2, i’ll post it later. useful to close resources but still throw the exception
    – JL Peyret
    Nov 22 at 21:27

















up vote
4
down vote

favorite













This question already has an answer here:




  • Weird Try-Except-Else-Finally behavior with Return statements

    2 answers




Can anyone explain why the following example does not raise the Exception?



def foo():

    try:

        0/0

    except Exception:

        print('in except')

        raise

    finally:

        print('in finally')

        return 'bar'



my_var = foo()

print(my_var)


This just returns:



in except

in finally

bar


Where as the same code without the return 'bar' statement throws the exception:



in except

in finally

Traceback (most recent call last):

  File "test.py", line 10, in <module>

    my_var = foo()

  File "test.py", line 3, in foo

    0/0

ZeroDivisionError: division by zero





python exception exception-handling try-except







share|improve this question













marked as duplicate by VPfB, jpp python
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 Nov 22 at 21:39


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  • you can catch the exception, assign it to a previously defined None variable and then reraise it in finally: Bit trickier to get working in python 3 than 2, i’ll post it later. useful to close resources but still throw the exception
    – JL Peyret
    Nov 22 at 21:27















up vote
4
down vote

favorite









up vote
4
down vote

favorite












This question already has an answer here:




  • Weird Try-Except-Else-Finally behavior with Return statements

    2 answers




Can anyone explain why the following example does not raise the Exception?



def foo():

    try:

        0/0

    except Exception:

        print('in except')

        raise

    finally:

        print('in finally')

        return 'bar'



my_var = foo()

print(my_var)


This just returns:



in except

in finally

bar


Where as the same code without the return 'bar' statement throws the exception:



in except

in finally

Traceback (most recent call last):

  File "test.py", line 10, in <module>

    my_var = foo()

  File "test.py", line 3, in foo

    0/0

ZeroDivisionError: division by zero





python exception exception-handling try-except







share|improve this question














This question already has an answer here:




  • Weird Try-Except-Else-Finally behavior with Return statements

    2 answers




Can anyone explain why the following example does not raise the Exception?



def foo():

    try:

        0/0

    except Exception:

        print('in except')

        raise

    finally:

        print('in finally')

        return 'bar'



my_var = foo()

print(my_var)


This just returns:



in except

in finally

bar


Where as the same code without the return 'bar' statement throws the exception:



in except

in finally

Traceback (most recent call last):

  File "test.py", line 10, in <module>

    my_var = foo()

  File "test.py", line 3, in foo

    0/0

ZeroDivisionError: division by zero




This question already has an answer here:




  • Weird Try-Except-Else-Finally behavior with Return statements

    2 answers







python exception exception-handling try-except




python exception exception-handling try-except






share|improve this question













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asked Nov 22 at 16:34









ezdazuzena

3,16022351




3,16022351




marked as duplicate by VPfB, jpp python
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 Nov 22 at 21:39


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marked as duplicate by VPfB, jpp python
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 Nov 22 at 21:39


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  • you can catch the exception, assign it to a previously defined None variable and then reraise it in finally: Bit trickier to get working in python 3 than 2, i’ll post it later. useful to close resources but still throw the exception
    – JL Peyret
    Nov 22 at 21:27




















  • you can catch the exception, assign it to a previously defined None variable and then reraise it in finally: Bit trickier to get working in python 3 than 2, i’ll post it later. useful to close resources but still throw the exception
    – JL Peyret
    Nov 22 at 21:27


















you can catch the exception, assign it to a previously defined None variable and then reraise it in finally: Bit trickier to get working in python 3 than 2, i’ll post it later. useful to close resources but still throw the exception
– JL Peyret
Nov 22 at 21:27






you can catch the exception, assign it to a previously defined None variable and then reraise it in finally: Bit trickier to get working in python 3 than 2, i’ll post it later. useful to close resources but still throw the exception
– JL Peyret
Nov 22 at 21:27














1 Answer
1






active

oldest

votes

















up vote
0
down vote













see https://stackoverflow.com/a/19805813/1358308 for more detail, but in brief



the finally block should always be executed, Python therefore has to ignore the raise statement as that would violate semantics






share|improve this answer




























    1 Answer
    1






    active

    oldest

    votes








    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    up vote
    0
    down vote













    see https://stackoverflow.com/a/19805813/1358308 for more detail, but in brief



    the finally block should always be executed, Python therefore has to ignore the raise statement as that would violate semantics






    share|improve this answer

























      up vote
      0
      down vote













      see https://stackoverflow.com/a/19805813/1358308 for more detail, but in brief



      the finally block should always be executed, Python therefore has to ignore the raise statement as that would violate semantics






      share|improve this answer























        up vote
        0
        down vote










        up vote
        0
        down vote









        see https://stackoverflow.com/a/19805813/1358308 for more detail, but in brief



        the finally block should always be executed, Python therefore has to ignore the raise statement as that would violate semantics






        share|improve this answer












        see https://stackoverflow.com/a/19805813/1358308 for more detail, but in brief



        the finally block should always be executed, Python therefore has to ignore the raise statement as that would violate semantics







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 22 at 16:38









        Sam Mason

        2,55011226




        2,55011226















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